SP-4S control unit
SP-4S units control functionality, intervention and failure of any industrial security device, both Proswitch and generic, using 4-wire operating systems (fail safe).
PS-4S control units are designed to control 4-wire security devices. A redundant circuit continuously monitors the presence of the 4-wire device by entering a monitoring signal. When the device is activated, the control circuit immediately de-energizes the safety relay, restarting the safety contacts at rest (N.O.).